Abstract: The effect of citrate free-radical oxidation intensity and aconitate hydratase, superoxide dismutase and catalase activities in liver and blood serum of rats with experimental toxic hepatitis has been investigated. Citrate administration to rats with hepatitis decreased biochemiluminescence parameters and conjugated diene content in rats tissues, increased under conditions of CCl4-induced liver damage. At the same time aconitase activity, decreased at the pathology, increases. The superoxide dismutase and catalase activities increased in at experimental toxic hepatitis, tended towards control values after citrate administration.